░█░█░█▀▀░█░█
░█▀█░█▀▀░▄▀▄
░▀░▀░▀▀▀░▀░▀

apt install hexedit

[ NOW WE CAN CHANGE THE FILE HEX NUMBERS ]

hexedit vid.mkv

[ FOR EX = CHOOSE ANY LINE AND ADD THIS HEX NUMBER ]

[ 57 68 69 74 65 63 72 6F 73 73 = WHITE CROSS ]

[ REMEMBER THE VIDEO'S OLD HEX WHERE YOU ENTER THE NEW HEX ]